[Gatts]

Also what can happen (but not very often) is that the number goes above 150% of the original - than they will go FRENZY
Why is FRENZY worse?
When your unit is in Frenzy - it turns HOSTILE only - and is fully dedicated enemy - attacking your units each time.

Happend to me using ghosts (when fighting large armies, and my own gosts attacked enemies even when out of control - so their number have risen more and more)
also when used vamps (I had one stack of red bats and one stack of red vamps - when I transformed any of these - the both went frenzy... 2/5 of my army turned against me - not nice look, believe me)